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      • KCI등재

        신경망을 이용한 휴대전화에 의한 RF 노출 평가 모델의 개발

        김수찬,남기창,안선희,김덕원,Kim Soo-Chan,Nam Ki-Chang,Ahn Seon-Hui,Kim Deok-Won 한국전자파학회 2004 한국전자파학회논문지 Vol.15 No.10

        이동통신 가입자가 증가함으로 인하여 휴대전화로부터 유발되는 전자파 노출 유해성 여부에 대한 논란이 끊임없이 제기되면서 이와 관련한 연구가 국제적으로 활발하게 이루어지고 있다. 휴대전화 사용에 관한 정보로 사용자 본인이 정량적인 전자파 노출량을 직접 알 수 있다면 매우 이상적일 것이다. 그러나 인체에 노출되는 전자파의 양을 직접적으로 측정하는 것은 매우 어렵기 때문에 정확한 노출량을 아는 것은 쉽지 않다. 따라서 본 연구에서는 국내외에서 선행된 연구 결과 및 쉽게 알 수 있는 휴대전화의 모델에 관한 간단한 정보, 사용경향을 이용하여 개인의 휴대전화 전자파의 노출 정도를 제시해 보고자 한다. 휴대전화 사용에 따른 노출 정도를 제시하기 위하여 1일 평균 통화시간, 총 사용기간에 관한 정보와 선행된 연구 결과들을 기반으로 휴대전화 사용시 이격거리와 기울기, 핸즈프리와 안테나의 사용 여부, 휴대전화의 SAR(Specific Absorption Rate), 플립 혹은 폴더형인지 등에 관한 인자들을 이용하였다. 이 인자들을 신경망 회로를 이용하여 노출 정도를 간접적으로 평가하여 사용자에게 제시해 보고자 하였다. The wide and growing use of cellular phones has raised the question about the possible health risks associated with radio-frequency electromagnetic fields. It would be helpful for phone users to blow the exposure levels during cellular phone use. But it is very difficult to recognize the amount of exposure, because measuring accurate level of RF is a difficult matter. In this study, we developed a model to estimate the exposure level and the individual risk of exposure by utilizing the available informations that we can get. We used such parameters as usage time a day, total using period, distance between cellular phone and head, slope of cellular phone, hands-free usage, antenna pulled out or not SAR(Specific Absorption Rate) of cellular phone, and flip or folder type. We proposed a model presenting individual risk of RF exposure from level 0 to 10 by using a neural network.

      • Symposium 2-2-3 (SYP 2-2-3) : Localized blistering associated with reticular pigmentation

        김수찬 ( Soo Chan Kim ) 대한피부과학회 2015 대한피부과학회 학술발표대회집 Vol.67 No.1

        A 26-year-old male patient presented with localized blistering since birth, accompanied with patchy, reticulated hyperpigmentation on the flexural areas since mid-teenage. He also showed mild palmoplantar keratoderma and diffuse alopecia on the scalp. Histopathology revealed intraepidermal blistering with degeneration of basal keratinocytes. Direct immunofluorescence showed negative result and immunofluorescence mapping showed KRT5, KRT10, collagen 4 & 7 deposition on the dermal side of the blister. Electron microscopy showed cytolysis and keratin clumping in the epidermis. Increased numbers of melanosomes in keratinocytes and dermal melanophages were also shown. Genetic analysis showed a mutation in KRT14 (exon1 c.374C>C, p.Arg125Cys), which is most commonly reported in the subtype previously known as EBS-DM.

      • KCI우수등재

        협업을 고려한 대기동지원임무 일정계획 연구

        김수찬(Soo Chan Kim),이태식(Taesik Lee) 대한산업공학회 2018 대한산업공학회지 Vol.44 No.2

        In this paper, we propose a MIP model for optimal planning of Countermaneuver Support Mission (CSM) through parallel machine scheduling. CSM is carried out by battle platoons of Engineer company, and is a military operation to stop or delay the enemy’s maneuver by using rockfall or bridge-blowing up. The concept of cooperation by platoons is proposed to shorten the mission completion time. We propose experimental results that the mission completion time with consideration of cooperation is shorter than that without consideration of cooperation. Additionally, we confirm that cooperation is still effective in shortening the mission completion time even if the capability is not at its maximum and is reduced by a certain ratio. Finally, since the parallel machine scheduling problem belongs to the NP-hard problem, we propose a solution approach using genetic algorithm in order to obtain a near optimal solution of a larger scale problem within a fast computation time.

      • KCI등재

        근전도와 임피던스를 이용한 손동작 추정

        김수찬(Soo-Chan Kim) 대한전기학회 2016 전기학회논문지 Vol.65 No.1

        EMG has specific information which is related to movements according to the activities of muscles. Therefore, users can intuitively control a prosthesis. For this reason, biosignals are very useful and convenient in this kind of application. Bioimpednace also provides specific information about movements like EMG. In this study, we used both EMG and bioimpedance to classify the typical hand gestures such as hand open, hand close, no motion (rest), supination, and pronation. Nine able-bodied subjects and one amputee were used as experimental data set. The accuracy was 98±1.9% when 2 bio-impedance and 8 EMG channels were used together for normal subjects. The number of EMG channels affected the accuracy, but it was stable when more than 5 channels were used. For the amputee, the accuracy is higher when we use both of them than when using only EMG. Therefore, accurate and stable hand motion estimation is possible by adding bioimepedance which shows structural information and EMG together.

      • Expert Lecture 1-2 : Diagnostic approaches of bullous diseases

        김수찬 ( Soo Chan Kim ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.1

        Blistering diseases are heterogeneous and include many diverse disorders. Over the past three decades, with the availability of new investigatory techniques and more sophisticated laboratory methods, enormous progress has been made in understanding these diseases. Blistering diseases can be mainly divided into the autoimmune bullous diseases and inherited bullous diseases. To do make a correct diagnosis of these blistering disorders, one should apply four different techniques: the clinical, histological, immunological and molecular biological methods. Histologic methods include H&E stain, immunohistochemical stains and electron microscopic examinations. Immunological methods include direct and indirect immunofluorescence studies, and ELISA. Molecular biological methods include immunoblotting and immunoprecipitation.

      • KCI등재

        적응 SFLC(Scaled Fourier Linear Combiner)를 이용한 활동 중의 PPG 신호의 잡음 감소

        金守贊(Soo-Chan Kim),金性珉(Sung-Min Kim),車殷宗(Eun-Jong Cha),金德源(Deok-Won Kim),柳在河(Jae-Ha Yoo),金東淵(Dong-Yon Kim) 대한전기학회 2006 전기학회논문지 D Vol.55 No.3

        Blood flow is one of vital signals related to human physiological information. Photoplethysmograph (PPG) has been used to measure indirectly heart rate, blood oxygen saturation (SpO₂), and so on. Because PPG signal is weak and sensitive to motion artifacts, it is very important to continuously obtain stable PPG signal during free movement. In this study, we applied the scaled Fourier linear combiner (SFLC) using both the adaptive filter and FLC to remove effectively the motion artifacts as well as background noise in the real time without additional signal correlated with motion from a accelerometer. The proposed method would be useful to reduce the movement and background noise which are not synchronized with heart rate.

      • KCI등재

        Kalman filter를 이용한 비접촉식 응시점 추정 시스템에서의 빠른 머리 이동의 보정

        김수찬(Soo Chan Kim),유재하(Jae Ha Yoo),김덕원(Deok Won Kim) 대한전자공학회 2007 電子工學會論文誌-SC (System and control) Vol.44 No.6

        자연스러운 머리 움직임 하에서 응시점을 추정할 수 있는 시스템을 제안하였다. 이 시스템은 하나의 카메라와 2개의 거울로 구성되어 있으며, 이 거울은 안구에서 눈동자의 영상을 언제나 카메라로 획득할 수 있도록 유지시키는 기능을 한다. 그러나 영상의 획득 속도가 초당 30 프레임이므로 거울의 제어가 빠른 머리 움직임을 보상할 수 없다. 이러한 문제점을 극복하고자 현재 안구 이미지에서 다음 안구 이미지의 위치를 추정하기 위하여 Kalman filter를 적용하였다. 그 결과 수평방향으로 평균 55㎝/s, 수직 방향으로 평균 45㎝/s정도의 속도의 머리 움직임에 대한 보상이 가능하였다. 그리고, 머리 움직임의 공간도 수평 60㎝, 수직 30㎝의 넓은 범위까지 가능하였다. 공간 해상도는 수평과 수직 각각 4.5°와 5°였고, 자연스러운 머리 움직임 아래에서의 응시점의 정확도는 92% 였다. We proposed an eye gaze tracking system under natural head movements. The system consists of one CCD(charge-coupled device) camera and two front-surface mirrors. The mirrors rotate to follow head movements in order to keep the eye within the view of the camera. However, the mirror controller cannot guarantee the fast head movements, because the frame rate is generally 30㎐. To overcome this problem, we applied Kalman filter to estimate next eye position from the current eye image. In the results, our system allowed the subjects head to move 60㎝ horizontally and 40㎝ vertically, with the head movement speed about 55㎝/sec and 45㎝/sec, respectively. And spatial gaze resolutions were about 4.5 degree and 5.0 degree, respectively, and the gaze estimation accuracy was 92% under natural head movements.

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